Trip hook



Dec. '30, 1930.

G. J. DORING 1,786,523

TRIP HOOK Filed March 19,' 1929 ff/'y1' s J0 N ZZ Z 26 @53; 5 Il Z5 i f 36 .34 29 /7 X l 27 Inventor z /7 ,wyegffa'm Patented Dec. 30, 1930 PATENT OFFICE GEORGE J. DOERING, OF EVANSTON, ILLINOIS TRIP HOOK Application filed March 19, 1929.

This invention relates to trip hooks to be used in conjunction with releasing weights whereby the weight is dropped upon objects such as steel, frozen earth, brick walls for the purpose of breaking the object dropped upon into smaller particles.

One of the objects ofv the'v invention is to provide a trip hook of the character described, wherein the hook member is auto- V-lll'matically held in coupled relation to the tripping lever so as to insure locking of the parts when the drop or weight is lifted from the ground.v

Another object of the invention is to provide, a device of the character referred to,

which is very simple in its method of assembling the parts, without sacricing the durability or safety of the operator.

Further objects of the invention are to zoyprovide, a trip hook of the character described, which is strong, durable, and compact, highly efcient for its intended purpose, Athoroughly Yreliable in its operation, formed of light parts in comparison to the weight supported, and comparatively inexpensive to manufacture and assemble.

With the foregoing and other objects in view, the Vinvention consists in the novel construction, combination and arrangement a'ofparts .as'will be hereinafter more specically .describedY and illustrated in the accompanying drawings, wherein is shown an embodiment of the invention, but it is to be modifications may be yresorted to, without departing from the spirit of the claims hereunto appended. v

In the drawings, wherein like referencechar- -acters denote corresponding parts throughout the several views:

Figure lis an elevation ofthe device in accordance with its invention. Figure 2 is an elevation,'partly in section, 'andtajken substantially onthe line 2-2 of `Figure 1 and l Figure 3 is a transverse sectional view in detail and taken onk the line 3 3, Figure 1. In ythe art of trip hooks for releasing a V"understood that changes, variations andA weight or a dropfor breaking objects upon which'the 'drop or vweight' falls, considerable Serial No. 348,347.

difficulty has been experienced in fabricating a trip hook which will release the weight when suspended in the air, without sacrificing the safety or lifting facto-r of the hook portion. Difficulty has arisen from the fact that just prior to a time when the weight is lifted from the ground, the hook portion will be released from the tripping lever, whereby the weight or drop will become de tached therefrom and with the attendant danger of rolling upon the operator or otherwise injuring him due to the flying hook that has become released.

Having the foregoing in mind, and referring to the drawings in detail, the body por tion indicated generally at 5, is formed of a pair of spaced, complementary plates 6 and 7 of substantially rectangular configuration. At one end of the body portion formed by the spaced plates 6 and 7, a clevis 8 is rockably mounted thereon and the clevis is supported on a bolt 9, having reduced portions 10, and 11 at the opposite ends thereof which extend through openings 12 and 13 on the arms of the clevis and openings le and 15 vadjacent the end of the plates 6 and 7. All of the openings are in alignment and the adjacent openings 12 and 14 of the clevis and plate and the openings 15 and 18 of the clevis and plate are in registration with each other to .form a continuous opening through which the respective reduced portions of the bolt 9 extend. The intermediate enlarged portion of the bolt 9 forms a shoulder where it merges into the reduced portion and said shoulder, on the opposed sides thereof abuts against the inner opposed. faces of plates 6 and 7 toform a support to prevent bending of the plates at this end thereof.

A tripping lever indicated generally at 16 .is rockably mounted on and supported between the spaced plates 6 and 7 intermediate its ends. The thickness of the tripping lever should ,be such as to permit it to freely rock between the inner faces of the plates but still frictionally abut said faces to form a support intermediate the ends of said plates. The tripping lever 16 has a pair oftrun- "Il'O'I'l'S 17, and 18 'formed on its Opposite 'side Jil faces and projecting laterally therefrom through circular openings 18 and 19 extending through the opposed plates (l and 7, in alignment with each other. The tripping member 16 extends laterally of' the plates forming the body portion, on each side thereot' and on one end ot said member is formed a loosely mounted ring 21. That portion ot the tripping member i6 `which projects beyond the other side ot the body por .on flares outwardly7 as indicated at 22, and is formed with a circular opening 23, for reception ot an end ot the hook to be presently described. The opposed trunnions 17, and 18 are 'formed f with slots Q4, which extend diametrically through them, at a point Wheresaid trunnions emerge trom the openings 19, 2O in the plates i'or the purpose of providing anchoring slots for supporting the cetter pins, one of which is shown at 26.

These )ins anchored in the slot Drevei'it lateral movement oi: the nlate on the trunl mons, While at the same time tl y hohr said plates 1n abutting relation to that portion et the tripping member 16 which extends through the plate.

A hook member indicated generally as at 2T is formed on one end with an enlarged area which is roclrably mounted between the plates 6 and 7, upon t-he bolt 2S which eX- tends through the respective plates and the enlarged portion 29 oit said hool. The enlarged portion 29 merges into a substantially straiffht end 30. Wiicli extends in a plane #n f i substantially at right angles 'to the enlarged portion 25). The straight end 30 is circular in cross section and adjacent the ends et said end, a dat declining tace 31 is :formed thereon to provide clearance between the rocking movement oi the lever and the hook 2. -Tho circular end member 30 of the hook extends through the opening 23 in spaced relation thereton when the trip is in the position shown in Figure 1 ot t ne drawings. Vhere the enlarged portion 29 merges with the end portion 30, a curved portion, indicatedat 32, forms the neel: lllereoetw'een upon which the weight or drop is suspended.

A substantially U-shaped spring indicated generally at 3B has a bight portion and opposite legs 35, 36, straddling the lower ends ot the body portion 5 formed by the pair ot plates.

The ends of the legs of the spring are coiled, one of the coils being shoivn at 86, and the said coil being attached to 'the opposed sides ot the plates G and 'T by means of a pair of hold-tast devices, one ot which is shown at 37. The bight portion Slt, ot the spring abuts against the outer enlarged portion 29 of the lioolr,e:\;erting a pressure thereon which maintains the hook in coupled relation with the tripping lever 16. The spring 33 automatically moves the hook 27 in coupled relation to the lever 16 as will be clearly understood by references to Figure 1 ot the drawings.

ln the application ot the trip hooks in accordance with this invention, the hoisting line from a derriclr, stationary crane or other device attached to the clevis 8 and suspended thereby, for raisii g' or lowering the trip hoolr. A tripping line is attached 1to and tno the ring 21 on the tripping lever 16 toe tripping line is held in 'the other end oft *l h ands of the operator. The Weight or drop (not shown) usually h: s a circular loop in the top thereot for attachment to the trip hoolr. To attach the Weight or drop,y the tripping lever is rocked on its trunnions until the opening 23 frees itself from the portion 3G t the hoolr member 27 at which time the betorementioned link on the Weight is inserted in the hooimember 2'? resting in the neel; 32 thereoi".

)it this point the tripping lever is released and the spring 33 automatically holds the hoolr 27 in coupled relation. to the tripping lever 1G so as to maintain the coupled relation until a strain is talreii up by the derrick, so that the Weight or drop will not become detached from the trip hook until a strain is taken thereby.

lllhen the line from the derrick begins to lift the Weight, the lever 16 locks tightly in the opening 23 surrounding the end portion o't 'the hoolrineniber 29, thereby sustaining the iveifrht suspended on the neck 32 ot said hook.

1When the Weight has reached the desired height, the operator may pull on the trip e yrhereby the 'tripping lever is rocked up- Y2.

Lly and releases the hook 27 which leXes the spring 34e, until the Weight is released, 1Whereupon the spring returns the hoolr member 27 to normal position as shown in Figure 1 ot the drawings. y i

Having described my invention, what 1 claim is:

l. ln a trip hook of the character described n comprising a body portion formed of a pair ot complementary spaced plates, a clevis reclrably mount-eden one end of saidplates, a. tripping lever rockably mounted intermediate its ends between an intermediate portion ot said plates, said tripping lever having an opening formed in one free end and an attaching ring on the other free end thereof, a hook member havin one end rockably mounted between the other end of said plates, the tree end of said hook member adapted for detachably seating in the opening in the tripping lever for detachably coupling the hook member and the tripping lever, and means for automatically retaining said tripping lever and hook member in coupled relation. Y v

2. Ina trip hoolr of the character described comprising a body portion formed of a pair of complementary spaced plates, a clevis yes rockably mounted on one end of said plates, a tripping lever rockably mounted intermediate its ends between an intermediate portion of said plates, said tripping lever having an opening formed in one free end and an attaching ring on the other free end thereof, a hook member having one end rockably mounted between the other end of said plates, the free end of said hook member adapted for detachably seating in the opening in the tripping lever for detachably coupling the hook member and the tripping lever, means for automatically retaining the said tripping lever and hook member in coupled relation, said automatic means comprising a U-shaped spring secured to said plates and straddling the lower ends thereof.

3. In a trip hook of the character described comprising a body portion formed of a pair of complementary spaced plates, a clevis rockably mounted on one end of said plates, a tripping lever rockably mounted intermediate its ends between an intermediate portion Vof said plates, said tripping lever having an opening formed in one free end and an attaching ring on the other free end thereof, a hook member having one end rockably mounted between the other end of said plates, the free end of said hook member adapted for detachably seating in the opening in the tripping lever for detachably coupling the hook member and the tripping lever, means for automatically retaining the said tripping lever and hook member in coupled re` lation, said automatic means comprising a U- shaped spring secured to said plates and straddling the lower ends thereof, said clevis, tripping lever and hook member being rockably coupled to said plates along the longitudinal median thereof.

In testimony whereof I affix my signature.

GEORGE J. DOERING. 

